Window-screen.



G. H. DAVIS. WINDOW SCREEN. APPLICATION FILED JAN. 3, 1914.

Patented B80221914,

UNED

GEORGE E. DAVIS, OF PORTLAND, MAI

F l?012,512LAND,c MAINE,

WINDOW-scminn.-

Specification of Letters Patent.

l Application filed January 3, 1914. Serial No. 810,239.

To JZZ whom it may concern I, GEORGE H. Davis, a

Be it known that citizen of the United States, residing at Portland, in the countyA of Cumberland and State of Maine, have invented certain new stantly flat or taut condition irrespective of and useful Improvements in Window- Screens, of which the following is a specification, ieference being had therein to the accompanying drawing.

' This invention relates to improvements in window screens, and more particularly to rolling screens, and has for its primary ob- ,ject the provision of improved'ins/trumentalities for maintaining the screen in a con- 'its position of adjustment, and facilitating,

the unwinding or winding of the screen.

Devices have heretofore been furnished in this art for maintaining a screen or simllar device in a ent improvements have peculiarly beneficial in simple, inexpensive and taut condition, but the presbeen found to be that by an extremely efficient combination of parts, I am enabled to accomplish the desired ends.

The preferred-embodiment of my invenf tion, above broadly defined, contemplates the provision, screen and its roller, associated with the free` for holding the same and vcondition of the screen cords connected to par screen roller facilitating unwinding of saidroller the 'cord and'tension devices or in combination of a'tensioning device with a flexible edge of the screen maintaining a taut fabric, including ts carried by the 'the winding and the association of device being y such that as the roller with thescreen winding thereon increases in pared to the decreasing the rotatable part carriedby the' roller, as the cord leaves said part,

vice will compensate for ence in the extents Ydiameter, as comof the diameter of the. relative differof movement of the cord and screen material, andthe same will be true lwhen the roller portion decreases in size with a corresponding increase in the sizeof the rotatable part to which the cord is attached and as an inci ing of the cord thereon. I believe that I am the contemplate the provision dent to the rewind- In this connection, first in the art to -of a tensioningdevice as an element carried by a moving part of the screen itself, as distinguished from the mounting of a tensioning dein illustrated in the tensioning detothe adjacent ends of coil springs' K, t

mounting in a window frame, and the protection of the parts by reason of the inclosure of the tension deviceitself.

I have illustrated in the accompanying drawings the preferred embodiment of the invention to which I have alluded, and the details in the arrangement and combination of parts thereofl will from an inspection of such drawings in connection withthe specific description hereinafter contained.

In the drawings, Figure 1 isa front elevation of a window casing with my improved screen applied thereto, Fig. 2 is a vertical sectional view and associated .parts of the casing, Fig. is a front'elevation ofthe screen detached, Fig. l4 is an` elevation looking toward one edge of the same, and Fig. 5, is a view similar to Fig. 3', illustrating additional details andshowing the manner of applying the screen to thewindow frame.

Referring more specifically -to the drawings, A represents an ordinary window casing having ways B for the edge of the screen, and a vided therefor and not necessary to beheredetail. Mounted lwithin the casing C is a roller D free to rotate and to which the end of the screen fabric E is. ssecured, the edges e lof said fabric working in the gudeways B, and the free end e of the fabric=carrying a hollorw tube F.

At the opposite endsof the roller arev fastened to rotate therewith a lpair of drums Gr, to'which are groovedA pulleys or Patenieanee. 22, i914.

through the screen' be readily appreciated secured thereto suitable' guidesecured the ends of cords or bands H, the l tion opposite to that ofthe-screen fabric,

' cords running from said pulleys in a direcas shown, and downwardly around sheaves mounted on the' window frame I pivotally D thence over'similar sheaves J or casing mounted in the ends of the tube F, where the I cords are fastened as at f1 the' terminals of inner ends of the springs being secured to the tube F as at la. Adiacent to the Iroller D los theico'rds pass over guide sheaves L to direct the cords into the .guideways B.

In adjusting a screen formed Aas above suggested, I place the free end of the screen at approximately its middle position, that is with the cords H and the fabric of the ,screen half wound on the roller I) and drums .'ciated that G respectively, so that the diameters of the said roller'and drums with the screen mate- 10 rial and cords wound thereon are about equal.v l/Vith this in mind, it will be appreas the screen is moved toward or from said position, the relative diameters of the parts in question will vary, the relation depending upon whether the screen is being wound or unwound, and to compensate for the varying degrees of movement of the cords and screen fabric, the springs K will expand or contract. This insures a constant tension upon the cordsI-I and cooperating with the hollow tube or stick F and the roller D, as will be apparent, will maintain the screen in a flat taut condition wherever adjusted.

in the winding yor unwinding of the bands and flexible member, substantially as described. 4

2. In combination with a flexible member of the character described and its roller, of tensioning means therefor comprising bands secured to parts of said roller, and yieldable means carried by the flexible member adapted to compensate for the relative variance in the winding or unwinding of the bands and flexible member, in combination with a hollow part carried by the flexible member housing said yieldable means.

3. In combination -with a Hexible member of the character described and its roller, of tensioning means therefor comprising bands secured to parts of said roller, and yieldable means carried by the flexible member adapted to compensate for the relative variance in the winding or unwinding of the bands and flexible member, said yieldab'le means manegecomprising lprings 'adapted to expand and contract for the purpose described. y

4. In combination with a flexible member of the character described and its roller, of tensioning means therefor comprising bands `secured to parts of said roller, and yieldable means carried by the flexible member adapted to compensate for the relative variance in the winding or unwinding of the bands and flexible member, in combination with a hollow part carried by the flexible member housing said yieldable means, said yieldable means comprising springs mounted in said hollow part, for the purpose described.

5. In combination with a flexible member of the character described and its roller, of tension means therefor comprising oppositely disposed bands connected at one end to apart of said roller, stationary guides over which an intermediate portion of the bands may work, and yieldable means carried by a movable part of the flexible member to which the terminals of the bands are attached, and guiding means carriedby said flexible member for said cords, substantially as described.

6; In combination with a flexible member of the character described and its roller, of tension means therefor comprising oppositely disposed bands connected at one end to a part of said roller, stationary guides over which an intermediate portion of the bands may work, and yieldable means carried by a movable part of the flexible 'member to which the terminals of the bands are attached, and guiding means carried by said flexible member for said bands, in combination with an inclosing tubular part for said vieldable means and said last menti'one guides.

7. In combination with a flexible member of the character described, and its roller associated with one edge of the same, of tensioning means for said member comprising bands attached at one end to parts connected to rotate with the roller andat the opposite end to the relatively free edge portion of the flexible member, guides for the intermediate portions of said bands, and yieldable tensloning devices operatively associated with corresponding end portions of the bands, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE I-I. DAVIS Witnesses: V l

lL. G. WEYMOUTH, FRANK Il. Rianne. 

